JP3474242B2 - Bending method of plate material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of bending a plate material, which is formed by bending a part of the plate material into an L shape.

[0002]

2. Description of the Related Art The applicant of the present application has disclosed in Japanese Patent Application Laid-Open No. 2-2
The technology described in Japanese Patent No. 58117 has been completed and applied for. In the above prior art, first, a plurality of slits are formed on the plate material on the same straight line, leaving the connecting portion.
Then, the connecting portion is bent with reference to a bending line that is substantially on the same straight line as the slit. According to the above-mentioned prior art, since the connecting portion is bent, a part of the plate material can be easily bent into an L-shape.

[0003]

However, in the above-mentioned prior art, since the connecting portion is deformed into a fan shape and the slit is deformed into a V-shaped groove corresponding to the plate thickness of the plate material, bending is performed. There is a problem that the appearance of the formed plate material is not good and that measures for increasing the strength of the bent portion after the bending work become troublesome.

[0004]

In order to solve the above-mentioned conventional problems, in the invention described in claim 1,
In a method of bending a plate material for bending a part of the plate material into an L-shape, (i) a plurality of long slits are formed on the plate material on the same straight line, and the plate material is divided into a pair of partition parts, leaving a connecting portion. A step of forming a partition; (ii) a step of forming a short slit by intersecting an end portion of each long slit; and (iii) the step of forming the section after the steps (i) and (ii) are completed. And a step of bending the region between the pair of short slits in the portion with reference to a bending line that passes through the tip of each short slit and is parallel to the plurality of long slits.

According to a second aspect of the present invention, in a method of bending a plate material for bending a part of the plate material into an L shape, (i) a plurality of long slits on the same straight line in the plate material By irradiating the part to be cut with a thermal cutting beam under an irradiation angle that is substantially the same as the cutting taper angle, a plurality of long slits are formed on the plate material on the same straight line, and the plate material is divided into a pair of sections with the connection part left. Section, and (ii) a step of forming a short slit by intersecting the end of each long slit with each other, and (iii) the above (i) step and (ii) step, after the above, And a step of bending the region between the pair of short slits in the connecting portion with reference to a bending line that passes through the tip of each short slit and is parallel to the long slits.

According to a third aspect of the present invention, in the method of bending a plate material for bending a part of the plate material into an L shape, (i) a plurality of long slits on the same straight line in the plate material By irradiating the part to be cut with a thermal cutting beam under an irradiation angle that is substantially the same as the cutting taper angle, a plurality of long slits are formed on the plate material on the same straight line, and the plate material is divided into a pair of sections with the connection part left. And (ii) a step of forming a short slit by intersecting an end of each long slit with each other, and (iii) after the steps (i) and (ii) are completed, A step of bending the region between the pair of short slits in the connecting portion with reference to a bending line on the same straight line as the long slit, and (iv) after the step (iii) is completed, one partition is In the thickness direction of the compartment of Characterized by comprising a step of relatively moving to that front side.

According to a fourth aspect of the present invention, in a method of bending a plate material for bending a part of the plate material into an L shape, (i) a plurality of long slits on the same straight line of the plate material By irradiating the cutting surface of the plate material with a thermal cutting beam from the spreading side that attempts to spread the cut surface of the plate material along the plate thickness direction, a plurality of long slits are formed on the plate material on the same straight line and connected. A step of partitioning the plate material into a pair of partition parts leaving a part, (ii) a step of processing and forming a short slit at the end of each long slit, respectively, and (iii) the (i) step and the above (Ii) after the step is completed, a step of bending the region between the pair of short slits in the connecting portion with reference to a bending line passing through the tip of each short slit and parallel to the long slits. Be prepared Is characterized by.

[0008]

According to the structure of the invention described in claim 1, since the connecting portion is bent on the basis of the bending line, it is possible to easily bend a part of the plate material into an L-shape even with a small force. You can In addition to the plurality of long slits, short slits are processed and formed, and the region between the pair of short slits in the connecting portion is bent. The convex part in the partition part of is filled. Furthermore, since the bending line passes through the tip of each short slit and is substantially parallel to the long slit, bending the connecting portion with the bending line as a reference makes a part of the plate material L-shaped. Almost at the same time as the bending is performed, the V-shaped groove fills the convex portion of one partition.

According to the configuration of the invention of claim 2 or 3, like the configuration of the invention of claim 1, a part of the plate material can be easily bent and formed into an L-shape even with a small force. In addition, the V-shaped groove formed by the deformation of the long slit is filled with the projection of one partition. In particular, according to the configuration of the invention described in claim 2, substantially at the same time when a part of the plate material is bent and formed into an L-shape, the convex portion of one partition is embedded in the V-shaped groove. . Further, according to the configuration of the invention described in claim 2 or claim 3, since the portion corresponding to the long slit is irradiated with the thermal cutting beam under the irradiation angle substantially the same as the cutting taper angle, the other section It is possible to make the cut surface of the part substantially perpendicular to the back side surface (or the front side surface), and when a part of the plate material is bent and formed into an L shape, the cut surface of the other partition part It is possible to prevent a gap from being generated as much as possible between the convex portions of the one partition portion.

According to the structure of the invention described in claim 4, as in the structure of the invention described in claim 1, it is possible to easily bend a part of the plate material into an L-shape with a small force. The V-shaped groove formed by the deformation of the long slit is filled with the convex portion of one partition. Further, at the same time when a part of the plate material is bent and formed into an L-shape, the convex portion of one partition is embedded in the V-shaped groove. Furthermore, since the portion corresponding to the long slit is irradiated with the heat cutting beam from the spread side which is intended to give spread to the cut surface of the plate material along the plate thickness direction, the irradiation amount of the heat cutting beam is adjusted to By adjusting the spread angle of spread, when a part of the plate material is bent and formed into an L shape, the angle formed by the pair of partition portions can be set to a predetermined angle.

[0011]

EXAMPLE A method for bending a plate material according to the first example will be described.

Referring to FIG. 1, in order to bend the plate material 1, a plurality of long slits 3 are formed on the plate material 1 on the same straight line, so that the plate material 1 is left with the connecting portions 5 left. A partition is formed in the first partition 7 and the second partition 9 (see FIG. 1). Next, the short slits 11 are formed at the ends of the long slits 3 so as to be orthogonal to each other (an example of intersection) (see FIG. 1).

Here, the long slit 3 and the short slit 1
1 is processed by, for example, laser processing, plasma jet processing, or the like, and the short slit 11 may be processed and formed before the long slit 3 is processed and formed. The short slit 11 may have different lengths on the back side 9a and the front side 9b of the second partition 9 as shown in FIGS. 4 (a) and 4 (b). As shown, it may be formed on the first partition 7 in addition to the second partition 9 (in this case as well, the back side 9a of the partition 7,9,
11a and the front sides 9b and 11b may have different lengths).

The length of the long slit 3 is the short slit 1
It is not always longer than the length of 1.

Referring to FIGS. 2 and 3, after the long slits 3 and the short slits 11 are formed on the plate material 1, the plate material 1 is supported by the die shoulder piece 13 and the die plate retainer 15 of the bending machine. Then, the punch 17 is lowered and the plate material 1 is clamped by the punch 17 and the die plate retainer 15.

Then, by further lowering the punch 17, the die shoulder piece 13 is moved upward relative to the die plate retainer 15, and the region between the pair of short slits 11 in the connecting portion 5 is folded. By bending with the bending line L as a reference, a part of the plate material W can be bent and formed into an L shape (see FIG. 2). Here, the bending line L is a line that passes through the tip of each short slit 11 and is substantially parallel to the long slit 3 as shown in FIG. In addition, in the plate material 1 after the bending process, as shown in FIG. 3, the convex portion 1 in the end surface of the first partition 7 and the second partition 9 is formed.
A minute gap g is generated between the slits 9. However, in order to reduce the gap g, it is desirable that the length of the short slit 11 be equal to or less than the plate thickness.

The process of the bending process described above will be described in detail as follows. That is, since the region between the pair of short slits 11 in the connecting portion 5 is bent based on the bending line L, a part of the plate material 1 can be easily bent and formed into an L-shape even with a small force. . Further, in addition to the plurality of long slits 3, the short slits 11 are processed and formed, and the region between the pair of short slits 11 in the connecting portion 5 is bent, so that the long slits 3 of the long slits 3 are formed as shown in FIG. Second in the V-shaped groove caused by deformation
Convex part in partition 9 (long slit 3 and short slit 11
(Part divided by) 19 is filled. Further, since the bending line L passes through the tip of each short slit 11 and is substantially parallel to the long slit 3, the connecting portion 5
The plate material 1
Almost at the same time when a part of the above is bent and formed into an L shape, the convex portion 19 is buried in the V-shaped groove.

According to the first embodiment as described above, the plate member 1
It is possible to easily bend and form a part of the plate material into an L-shape even with a small force, so that the work efficiency of the bending process of the plate material 1 is improved.

V generated by the deformation of the long slit 3
Since the convex portion 19 of the second partition 9 is embedded in the groove having a character shape, even if a part of the plate material 1 is bent and formed into an L-shape, the appearance of the bent portion of the plate material 1 is not damaged, and the bent portion is bent. Measures for increasing the strength of the portion (for example, welding work) can be easily performed.

Further, by bending the connecting portion 5 with the bending line L as a reference, a part of the plate material 1 is bent and formed into an L shape, and at the same time, the convex portion 19 is formed in the V-shaped groove. Since the number of steps in the bending work is reduced, the work efficiency is improved.

Next, a method of bending the plate material according to the second embodiment will be described. The bending method of this plate material is
It was invented by paying attention to the fact that the cut surface of the plate material 1 is tapered when the laser beam LB is irradiated substantially perpendicularly to the plate material 1 by the laser processing head 21 as shown in FIG. .

Referring to FIG. 7, the laser machining head 21 is appropriately operated with respect to a portion of the plate material 1 corresponding to a plurality of long slits 3 on the same straight line, and the irradiation angle θT is the same as the cutting taper angle θT. A laser beam LB (an example of a thermal cutting beam) is irradiated under

By this, a plurality of long slits 3 can be formed on the plate material 1 on the same straight line, and the plate material 1 can be partitioned into the first partition portion 7 and the second partition portion 9 while leaving the connecting portion 5. (See FIG. 7 (a)). Here, the cutting taper angle θT means the inclination angle of the cutting surface when the laser heme LB is irradiated substantially perpendicularly to the plate material W as shown in FIG.

After a plurality of long slits 3 are formed on the plate material 1, short slits 11 are formed at the ends of each long slit 3 by laser processing at right angles. In this case, it is desirable that the irradiation angle of the laser beam LB is substantially 0, that is, the irradiation is substantially perpendicular to the plate material 1.

After forming the long slits 3 and the short slits 11 on the plate material 1, the bending machine is appropriately operated so that the region between the pair of short slits 11 in the connecting portion 5 is formed by the long slits 3. Bending is performed with the bending line L ′ on the same straight line as a reference, and a part of the plate material 1 is bent and formed in an L shape (see FIG. 7B). The bending work of the connecting member 5 is performed by the bending machine or the like used in the first embodiment. After the connecting portion 5 is bent with the bending line L'as a reference, the first partition 7 is moved to the front side (lower side in FIG. 7) of the second partition 9 by the action of the pusher (not shown). The protrusion 19 is embedded in the V-shaped groove by moving the protrusion 19 relatively to (FIG. 7C).

Here, the irradiation angle θ is almost the same as the cutting taper angle.
Since the laser beam LB is irradiated to the portion corresponding to the long slit 3 under T, the cut surface of the second partition 9 (the right inner side surface of the long slit 3 in FIG. 7) is located on the back side of the second partition 9. It is possible to make the surface 9a (or the front surface 9b) substantially at a right angle, and when a part of the plate material 1 is bent and formed into an L shape, the cut surface of the second partition 9 and the first Compartment 7
It is possible to make the gap g between the convex portions 19 of 0 substantially 0 (see FIG. 7C).

Further, as in the first embodiment, when the connecting portion 5 is bent on the basis of a bending line L which passes through the tips of the short slits 11 and is substantially parallel to the long slits 3, a plate material is used. When a part of W is bent and formed into an L-shape, the convex portion 19 can be filled in the V-shaped groove almost at the same time. Therefore, the action of the pusher makes the first partition 7 and the second partition 9 have a plate thickness. It is not necessary to move relatively to the front side in the direction.

According to the second embodiment as described above, similarly to the first embodiment, since it is possible to easily bend and form a part of the plate material 1 into an L-shape even with a small force, the plate material 1 is bent. The work efficiency of the processing is improved, and since the convex portion 19 of the plate material 1 is embedded in the V-shaped groove generated by the deformation of the long slit 3, the appearance of the bent portion of the plate material 1 is not damaged, and Measures to increase strength can be easily taken.

Further, the cut surface of the second partition 9 can be made substantially perpendicular to the back side 9a (or the front side 9b) of the second partition 9, and a part of the plate 1 can be L-shaped. When it is bent and formed into a letter shape, the cut surface of the second partition 9 and the first
Since the gap g between the convex portions 19 of the partition 7 can be made substantially zero, the appearance of the bent portion of the plate material 1 can be further improved.

Finally, a method of bending the plate material according to the third embodiment will be described. This method of bending a plate material is invented by paying attention to the fact that the cut surface of the plate material 1 has a constant spreading direction when the laser beam LB is irradiated by the laser processing head 21, as shown in FIG. It is a thing.

Referring to FIG. 8 (a), the laser processing head 21 is appropriately operated with respect to portions of the plate material 1 which correspond to a plurality of long slits 3 on the same straight line.
Spreading side that tries to give spread to the cut surface along the plate thickness direction (in this case, the back side, the upper side in FIG. 8)
The laser beam LB. As a result, a plurality of long slits 3 can be formed on the plate material 1 on the same straight line, and the plate material 1 can be partitioned into the first partition portion 7 and the second partition portion 9 while leaving the connecting portion 5. Further, the laser processing head 21 is appropriately operated to form the short slits 11 at the ends of the respective long slits 3 so as to be orthogonal to each other.

After partitioning the plate material 1 into the first partition portion 7 and the second partition portion 9, the laser is applied to the portion corresponding to the long slit 23 which is parallel and collinear with the long slit 3. By appropriately operating the processing head 21, the laser beam LB is applied from the spreading side (in this case, the front side, which is the lower side in FIG. 8) which is intended to spread the cut surface of the plate material 1 along the plate thickness direction. Irradiate. As a result, the plate material 1
A plurality of long slits 23 parallel to the long slits 3 are formed on the same straight line, and the plate material 1 is divided into the first partition 7 and the second
In addition to partitioning into the partition part 9, the connection part 25 may be left and partitioned into the second partition part 9 and the third partition part 27.
Further, the laser processing head 21 can be appropriately operated to form the short slits 29 at the ends of the long slits 3 so as to be orthogonal to each other.

The laser beam LB may be applied to the portion corresponding to the long slit 3 and the portion corresponding to the long slit 23 under the same irradiation angle as the cutting taper angle.

After forming the long slits 3 and 23 and the short slits 11 and 29 on the plate 1, the connecting portion 5 is formed.
The area between the pair of short slits 11 is bent with reference to a bending line L1 on the same straight line as the long slit 3 to form a part of the plate material 1 in an L-shape. Then, by the action of the pusher (not shown), the first partition 7
Is moved to the front side (the lower side in FIG. 8) in the plate thickness direction of the second partition 9 so that the convex portion 19 is embedded in the V-shaped groove generated by the deformation of the long slit 3 (FIG. 8).
(See (b)).

After the first partition 7 is moved to the second partition 9 side, the region between the pair of short slits 29 in the connecting portion 25 is fold line L collinear with the long slit 23.
Bend with 2 as a reference, and part of the plate 1 is U-shaped (L
It is bent to form a character shape (see FIG. 9A). Then, by moving the second partition 9 to the front side (downward in FIG. 9) in the plate thickness direction of the third partition 27 by the action of the pusher, the V-shaped groove formed by the deformation of the long slit 23 is projected. The part (part divided by the long slit 23 and the short slit 29) 31 is filled.

According to the third embodiment as described above, as in the first embodiment, it is possible to easily bend a part of the plate material 1 into a U-shape even with a small force, so that the plate material 1 is folded. Bending work efficiency is improved and long slits 3,
The convex portion 1 of the plate 1 is formed in the V-shaped groove generated by the deformation of
Since 1 and 31 are buried, the appearance of the bent portion of the plate material 1 is not impaired, and measures for increasing the strength of the bent portion can be easily performed.

In particular, the laser beam LB is applied to the cut surface of the plate material 1 from the spreading side which is intended to spread along the plate thickness direction.
Is irradiated to the portions corresponding to the long slits 3 and 23, so that by adjusting the irradiation amount of the laser beam LB to adjust the spread angle, for example, a part of the plate material 1 is bent into an L shape. When formed, the angle formed by the first partition 7 and the second partition 9 can be set to a predetermined angle (90 ° or less), and bending accuracy can be improved.

[0038]

As will be understood from the above description of the embodiments, according to the invention described in any one of claims 1 to 4, even a small force is applied to a part of the plate material. Since it can be easily bent and formed into an L-shape, the work efficiency of bending the plate material is improved. Further, since the convex portion of the plate material is embedded in the V-shaped groove caused by the deformation of the long slit, the appearance of the bent portion of the plate material is not impaired, and measures for increasing the strength of the bent portion can be easily performed. obtain.

Further, claim 1, claim 2 and claim 2 according to the present invention.
According to the invention of any one of claims 4, since the convex portion is buried in the V-shaped groove almost at the same time when a part of the plate material is bent and formed in the L-shape, The work efficiency in bending work is reduced by reducing the man-hours.

Further, according to the invention described in claim 2 or 3, it is possible to make the cut surface of the other partition substantially perpendicular to the back side surface (or the front side surface). When a part of the plate is bent into an L-shape, it is possible to prevent a gap from being formed between the cut surface of the other partition and the projection of the one partition as much as possible. The appearance of the part can be further improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a process of a plate material bending machine in an invention according to a first embodiment.

FIG. 2 is a diagram showing a process of a plate material bending machine in the invention according to the first embodiment.

FIG. 3 is a diagram showing steps of the plate bending machine in the invention according to the first embodiment.

FIG. 4 is a diagram showing a processing mode of a short slit.

FIG. 5 is a diagram showing a processing mode of a short slit.

FIG. 6 is a diagram showing a state of a cut surface when a plate material is irradiated with a laser beam perpendicularly.

FIG. 7 is a diagram showing a step of bending a plate material in the invention according to the second embodiment.

FIG. 8 is a diagram showing a plate bending process in the invention according to the third embodiment.

FIG. 9 is a diagram showing a step of bending a plate material in the invention according to the third embodiment.

[Explanation of symbols]

1 plate material 3 long slits 5 connection parts 7 first division 9 Second division 11 short slits

Claims (4)

(57) [Claims] 1. A method of bending a plate material, which comprises bending a part of a plate material into an L shape, comprising: (i) forming a plurality of long slits on the plate material on the same straight line and leaving the connecting portion to form the plate material. Completion of the step of forming a pair of compartments, (ii) the step of forming a short slit by intersecting the end of each long slit, and (iii) the above (i) and (ii) After that, the region between the pair of short slits in the connecting portion, the step of bending with reference to the bending line that passes through the tip of each short slit and is parallel to the plurality of long slits. A method of bending a plate material characterized by: 2. A method for bending a plate material, which comprises bending a part of a plate material into an L-shape, comprising: (i) a portion corresponding to a plurality of long slits on the same straight line of the plate material, which has substantially the same cutting taper angle. By irradiating the plate with a plurality of long slits on the same straight line by irradiating the plate with a thermal cutting beam under an irradiation angle, and partitioning the plate into a pair of partitioning portions, leaving a connecting portion, and (ii) A step of forming the short slits by intersecting with each other at the end of each long slit, and (iii) after the above (i) step and (ii) step are completed, between the pair of short slits in the connecting portion. And a step of bending the region based on a bending line that passes through the tip of each short slit and is parallel to the long slit. 3. A method of bending a plate material, which comprises bending a part of a plate material into an L-shape, comprising: (i) a portion corresponding to a plurality of long slits on the same straight line of the plate material, which has substantially the same cutting taper angle. By irradiating the plate with a plurality of long slits on the same straight line by irradiating the plate with a thermal cutting beam under an irradiation angle, and partitioning the plate into a pair of partitioning portions, leaving a connecting portion, and (ii) A step of forming the short slits by intersecting the end portions of the long slits, and (iii) a step between the pair of short slits in the connecting portion after the step (i) and the step (ii) are completed. A step of bending the region with a bending line on the same straight line as the long slit as a reference, and (iv) after the step (iii) is completed, one partition is moved to the front side in the plate thickness direction of the other partition. Process of moving relatively A method for bending a plate material, comprising: 4. A method for bending a plate material, which comprises bending a part of a plate material into an L-shape, comprising: (i) a plate on a cut surface of the plate material at a portion corresponding to a plurality of long slits on the same straight line of the plate material. By irradiating a heat cutting beam from the spreading side that is going to give a spread along the thickness direction, a plurality of long slits are formed on the plate material on the same straight line, and the plate material is left as a pair of partition parts with the connecting part left. And (ii) a step of forming a short slit by intersecting the ends of the long slits with each other, and (iii) the step (i) and the step (ii) after completion of the above step. A region between the pair of short slits in the connecting portion, a step of bending with reference to a bending line that passes through the tip of each short slit and is parallel to the long slits. Bending method .